<!DOCTYPE html>
<html>

<head>
    <style>
        html,
        body {
            width: 100%;
            height: 100%;
            margin: 0;
        }

        body {
            position: relative;
            background:
                linear-gradient(to bottom, rgba(32, 255, 77, 0.15) 0px, rgba(32, 255, 77, 0.15) 2px, transparent 2px),
                linear-gradient(to right, rgba(32, 255, 77, 0.3) 0px, rgba(32, 255, 77, 0.3) 2px, transparent 2px), black;
            background-size: 40px 40px;
            /* background-repeat: no-repeat; */
        }

        /* 第一个大圈圈 */
        #f {
            position: absolute;
            top: 50%;
            left: 50%;
            margin-left: -250px;
            margin-top: -250px;
            box-sizing: border-box;
            width: 500px;
            height: 500px;
            border: 2px solid #1EEA47;
            background-image: radial-gradient(rgba(32, 255, 77, 0.3) 0%, transparent 75%);
            border-radius: 50%;

            overflow: hidden;
        }

        #f::before {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            content: '';
            width: 100%;
            height: 2px;
            background-color: #1EEA47;
        }

        #f::after {
            position: absolute;
            left: 50%;
            transform: translatex(-50%);
            content: '';
            width: 2px;
            height: 100%;
            background-color: #1EEA47;
        }

        /* 三个圈 */
        #f1 {
            position: absolute;
            top: 50%;
            left: 50%;

            margin-left: -175px;
            margin-top: -175px;

            width: 350px;
            height: 350px;
            border: 2px solid #1EEA47;
            box-sizing: border-box;
            border-radius: 50%;
        }

        #f2 {
            position: absolute;
            top: 50%;
            left: 50%;

            margin-left: -100px;
            margin-top: -100px;
            width: 200px;
            height: 200px;

            border: 2px solid #1EEA47;
            box-sizing: border-box;
            border-radius: 50%;
        }

        #f3 {
            position: absolute;
            top: 50%;
            left: 50%;

            margin-left: -25px;
            margin-top: -25px;
            width: 50px;
            height: 50px;

            border: 2px solid #1EEA47;
            box-sizing: border-box;
            border-radius: 50%;
        }
          /* 是在扇形的框框里面动画 */
        #zz {
            position: absolute;
            left: 0;
            top: 0;

            width: 248px;
            height: 248px;
            /* border: 1px solid red; */

            border-radius: 250px 0px 0px;
            background-image: linear-gradient(45deg, transparent, transparent 50%, rgba(1, 243, 49, 0) 50%, rgba(1, 243, 49, 1));
           /* 改变原点移动位置 */
            transform-origin: 100% 100%;
            animation-name: sm;
            animation-duration: 10s;
            animation-timing-function: linear;
            animation-iteration-count: infinite;
        }

        @keyframes sm {
            from {
                transform: rotate(0deg);
            }

            to {
                transform: rotate(360deg);
            }
        }

        /* 三个小点点---假的---糊弄人的 */
        #zz>div {
            position: absolute;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background-image: radial-gradient(rgb(30, 234, 71) 1px, rgba(30, 234, 71, .1));

            animation-name: yd, ss;
            animation-duration: 5s, 1s;
            animation-iteration-count: infinite;
            animation-timing-function: linear;
            animation-direction: alternate, normal;
        }

        #zz>div:nth-of-type(1) {
            top: 150px;
            left: 100px;
        }

        #zz>div:nth-of-type(2) {
            top: 140px;
            left: 50px;
        }

        #zz>div:nth-of-type(3) {
            top: 200px;
            left: 200px;
        }

        @keyframes yd {
            to {
                left: 120px;
            }
        }

        @keyframes ss {
            from {
                opacity: 1;
            }

            to {
                opacity: 0;
            }
        }
    </style>
</head>

<body>
    <div id="f">
        <!-- 扫描区 -->
        <div id="zz">
            <!-- 扫描区三个点点 -->
            <div></div>
            <div></div>
            <div></div>
        </div>
        <!-- 圈圈 -->
        <div id="f1">
            <div id="f2">
                <div id="f3"></div>
            </div>
        </div>
    </div>
</body>

</html>